MERCEDES EQC400 (2021)
Running costs, reliability data, and common problems from 64 real MOT tests.
Annual Cost
£950
£79/month
MOT Pass Rate
94%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 1-8
0cc Electric
Great Choice
94% pass rate, £950/year to run. 12 points above average.
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Annual Running Costs
Flat rate (post-2017)
Low estimate due to excellent reliability
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
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Reliability Verdict
Excellent reliability. Very few MOT failures. That's 12 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 5 years old, 94% of MERCEDES EQC400s from 2021 passed their MOT first time in 2026. That's based on 64 tests across the UK. The average mileage at this age is 44,097 miles.
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How Does It Compare?
Mileage Analysis
44,097
Average miles
37,000
Expected for age
The average 2021 MERCEDES EQC400 has 44,097 miles on the clock, which is in line with the expected 37,000 miles for a 5-year-old car, suggesting normal everyday use.
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About the 2021 MERCEDES EQC400
The 2021 MERCEDES EQC400 is a electric with a 0cc electric engine. 64 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 2021, the average MOT pass rate is 92%, and this model beats that benchmark.
With an average of 44,097 miles at 5 years old, MERCEDES EQC400 owners drive about as much as the UK average.
What does it cost to own a 2021 MERCEDES EQC400?
Total estimated annual running cost is £950 (£79/month), broken down as £500 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 94% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2021 MERCEDES EQC400
At 5 years old, the MERCEDES EQC400 offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. Note: with only 64 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 MERCEDES EQC400's fuel type, age, and engine size, these are the most likely problem areas to check.
Battery Degradation
Medium riskAfter 5 years, expect some battery capacity loss. Check the battery health report for state of health (SoH). Below 80% significantly reduces range.
Charging Port
Medium riskCharging connectors and ports can develop issues from regular use. Check both AC and DC charging work correctly before purchasing.
Software Updates
Medium riskOlder EVs may miss out on manufacturer software updates that improve range and features. Check the infotainment system is up to date.
12V Auxiliary Battery
Medium riskEVs still have a standard 12V battery for accessories. These drain faster than in petrol cars and can leave you stranded if flat. Replacement is £100-£200.
Service History
Low riskAlways request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.
Running Costs Compared
How the 2021 MERCEDES EQC400 stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES EQC400(2021) | 94% | £500 | £195 | Grp 1-8 | £950 |
| TESLA MODEL 3 LONG RANGE AWD(2021) | 88% | £500 | £190 | Grp 1-8 | £1095+£145 |
| JAGUAR I-PACE(2020) | 96% | £500 | £190 | Grp 1-8 | £945-£5 |
| TESLA MODEL 3 STANDARD RANGE +(2021) | 88% | £500 | £190 | Grp 1-8 | £1095+£145 |
| TESLA MODEL 3 PERFORMANCE AWD(2020) | 87% | £500 | £190 | Grp 1-8 | £1095+£145 |
Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.
Related Mercedes Models
Explore other Mercedes cars or similar models in the same category.
MERCEDES A
2019 · 1461cc Diesel
MERCEDES C
2017 · 1991cc Hybrid
MERCEDES A-CLASS
2017 · 1461cc Diesel
TESLA MODEL 3 LONG RANGE AWD
2021 · 0cc Electric
JAGUAR I-PACE
2020 · 0cc Electric
TESLA MODEL 3 STANDARD RANGE +
2021 · 0cc Electric
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